Share your screen using Messages on Mac
https://support.apple.com/guide/messages/screen-sharing-icht11883/mac
Share the screen of another Mac
https://support.apple.com/guide/mac-help/share-the-screen-of-another-mac-mh14066/mac
One important capability available to Mac owners is the
ability to screen share between any two Mac computers over
the internet. With the permission of both parties the
initiator can share remote owner's screen, sound and cursor
function.
Siri "Launch Screen Sharing"
From the Terminal
open -a Screen\ Sharing.app
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